[v3,00/10] HDCP2.2 Phase II

Message

Ramalingam C March 22, 2019, 12:44 a.m. UTC

HDCP2.2 phase-II introduces below features:
	Addition of three connector properties
		HDCP Content Type
		HDCP Topology
	Addition of binary sysfs "hdcp_srm"
	parsing for HDCP1.4 and 2.2 SRM table
	Once HDCP1.4/2.2 authentication is completed gathering the all
		downstream topology for userspace 
	Extending debugfs entry to provide the HDCP2.2 capability too.
	uevent for HDCP state change.

HDCP Content Type:
	This property is used to indicate the content type
classification of a stream. Which indicate the HDCP version required
for the rendering of that streams. This conten type is one of the
parameter in the HDCP2.2 authentication flow, as even downstream
repeaters will mandate the HDCP version requirement.

Two values possible for content type of a stream:
	Type 0: Stream can be rendered only on HDCP encrypted link no
		restriction on HDCP versions.
	Type 1: Stream can be rendered only on HDCP2.2 encrypted link.

There is a parallel effort in #wayland community to add the support for
HDCP2.2 along with content type support. Patches are under review in
#wayland community.

HDCP Topology:
This blob property is used by the kernel to pass the downstream topology
of the HDCP encrypted port to the userspace.

This is used by the userspace to implement the HDCP repeater, which KMD
implementing the HDCP transmitters(downstream ports) and userspace
implementing the upstream port(HDCP receiver).

Discussion is on going to add the downstream_info support in the
weston HDCP stack.

hdcp_srm: write only binary sysfs used by the userspace to pass the SRM
table of HDCP1.4 and 2.2. These are nothing but revocated list of
receiver IDs of the HDCP sinks. KMD will use this list to identify the
revocated devices in the HDCP authentication and deny the hdcp encryption to it.

Daniel has suggested about moving the SRM node implementation into DRM core.
Still dome more clarification is required. Once that is done another
respin on SRM patches are expected.


v2:
  srm is passed through binary sysfs [Daniel]
  CP abbreviation is expanded except for downstream_info [Daniel]
  restrictions at atomic_set_property is removed [Maarten]
  upon content type change durin encryption, HDCP is restarted within
	kernel [Maarten]
v3:
  property names are reworked [Pekka and Daniel]
  uevent is generated for HDCP state change. [Pekka and Daniel]
 
Series can be cloned from github
https://github.com/ramalingampc2008/drm-tip.git hdcp2_2_p2_v3

Test-with: <[e-mail]>

Ramalingam C (10):
  drm/i915: debugfs: HDCP2.2 capability read
  drm: Add Content protection type property
  drm/i915: Attach content type property
  drm/i915: HDCP SRM parsing and revocation check
  drm/i915/sysfs: Node for hdcp srm
  drm: Add CP downstream_info property
  drm/i915: Populate downstream info for HDCP1.4
  drm/i915: Populate downstream info for HDCP2.2
  drm: uevent for connector status change
  drm/i915: uevent for HDCP status change

 drivers/gpu/drm/drm_atomic_uapi.c   |   8 +
 drivers/gpu/drm/drm_connector.c     | 149 ++++++++++
 drivers/gpu/drm/drm_sysfs.c         |  28 ++
 drivers/gpu/drm/i915/i915_debugfs.c |  13 +-
 drivers/gpu/drm/i915/i915_drv.c     |   1 +
 drivers/gpu/drm/i915/i915_drv.h     |   6 +
 drivers/gpu/drm/i915/i915_sysfs.c   |  32 +++
 drivers/gpu/drm/i915/intel_ddi.c    |  21 +-
 drivers/gpu/drm/i915/intel_drv.h    |   7 +-
 drivers/gpu/drm/i915/intel_hdcp.c   | 407 ++++++++++++++++++++++++++--
 include/drm/drm_connector.h         |  27 ++
 include/drm/drm_hdcp.h              |  33 +++
 include/drm/drm_sysfs.h             |   5 +-
 include/uapi/drm/drm_mode.h         |  39 +++
 14 files changed, 743 insertions(+), 33 deletions(-)